CN105536552B - A kind of disc-type is modified the preparation method of diaphragm - Google Patents
A kind of disc-type is modified the preparation method of diaphragm Download PDFInfo
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- CN105536552B CN105536552B CN201510985978.2A CN201510985978A CN105536552B CN 105536552 B CN105536552 B CN 105536552B CN 201510985978 A CN201510985978 A CN 201510985978A CN 105536552 B CN105536552 B CN 105536552B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 49
- 239000002033 PVDF binder Substances 0.000 claims abstract description 48
- 239000012528 membrane Substances 0.000 claims abstract description 39
- 210000004379 membrane Anatomy 0.000 claims abstract description 36
- 239000002131 composite material Substances 0.000 claims abstract description 20
- 238000005266 casting Methods 0.000 claims abstract description 19
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 210000002469 basement membrane Anatomy 0.000 claims abstract description 11
- 239000011521 glass Substances 0.000 claims abstract description 8
- 239000011159 matrix material Substances 0.000 claims abstract description 7
- 238000009434 installation Methods 0.000 claims abstract description 6
- 229910021642 ultra pure water Inorganic materials 0.000 claims abstract description 5
- 239000012498 ultrapure water Substances 0.000 claims abstract description 5
- 239000012153 distilled water Substances 0.000 claims abstract description 4
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 36
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 27
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 15
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 15
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 15
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 claims description 9
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 claims description 9
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 9
- 238000004090 dissolution Methods 0.000 claims description 9
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 9
- 239000003125 aqueous solvent Substances 0.000 claims description 8
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- BCNBMSZKALBQEF-UHFFFAOYSA-N 1,3-dimethylpyrrolidin-2-one Chemical compound CC1CCN(C)C1=O BCNBMSZKALBQEF-UHFFFAOYSA-N 0.000 claims description 3
- 150000008065 acid anhydrides Chemical class 0.000 claims description 2
- 230000008859 change Effects 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- OUYLXVQKVBXUGW-UHFFFAOYSA-N 2,3-dimethyl-1h-pyrrole Chemical compound CC=1C=CNC=1C OUYLXVQKVBXUGW-UHFFFAOYSA-N 0.000 claims 2
- -1 2h is stood Substances 0.000 abstract description 5
- 238000004140 cleaning Methods 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 3
- 238000007711 solidification Methods 0.000 abstract description 3
- 230000008023 solidification Effects 0.000 abstract description 3
- 239000003795 chemical substances by application Substances 0.000 abstract description 2
- 230000000903 blocking effect Effects 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 14
- 239000000306 component Substances 0.000 description 9
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000001223 reverse osmosis Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/10—Supported membranes; Membrane supports
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/30—Polyalkenyl halides
- B01D71/32—Polyalkenyl halides containing fluorine atoms
- B01D71/34—Polyvinylidene fluoride
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/02—Hydrophilization
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/02—Details relating to pores or porosity of the membranes
- B01D2325/021—Pore shapes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/02—Details relating to pores or porosity of the membranes
- B01D2325/026—Sponge structure
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a kind of disc-type be modified diaphragm preparation method, including：First prepare casting solution, then by casting solution, into first film, glass plate is automatically disengaged after solidification forming for striking on a glass, place it in ultra-pure water impregnate 12 ~ for 24 hours, PVDF basement membranes are made；After cleaning PVDF basement membranes with distilled water, 2h is stood, composite modified reagent is uniformly coated on its surface, modified PVDF membrane is made after naturally dry；By modified PVDF membrane, support flow-guiding screen and modified PVDF membrane compacting stacked on top of one another in one, Modified Membrane sheet matrix is made；Disk shape is made in Modified Membrane sheet matrix, flanging simultaneously opens up installation through-hole, finished product.Product suppleness made of the present invention is high, is unlikely to deform, and the hole formed on film is in mandruka reticular structure, blocking up property of anti-pollution is substantially increased, current potential processing is also carried out to film surface by modifying agent, makes its more hydrophilic, and film adhesion is strong, is not readily separated peeling.
Description
Technical field
The present invention relates to water-treatment technology field, in particular, referring to the preparation side that a kind of disc-type is modified diaphragm
Method.
Background technology
Reverse osmosis technology principle be under the action of higher than solution osmotic pressure, according to other substances cannot penetrate semi-permeable membrane and
These substances and water are separated.The membrane aperture of reverse osmosis membrane is very small, therefore can effectively remove the dissolving salt in water removal
Class, colloid, microorganism, organic matter etc..System has many advantages, such as that water quality is good, energy consumption is low, pollution-free, simple for process, easy to operate.
As it can be seen that reverse osmosis membrane is the core component of reverse osmosis technology, the effect of anti-penetration wastewater disposal and the direct phase of the quality of reverse osmosis membrane
It closes.
The existing diaphragm for embrane method processing is roughly divided into square plate type diaphragm and round board-like diaphragm, wherein square plate
Formula diaphragm self-strength is less high, and ABS plates is needed to support and fix, and avoids flexural deformation, diaphragm hole is linear, easily dirty
Stifled, film adhesion is also general, and there are stripping risks；Round board-like diaphragm relative intensity is higher, although can not have to ABS plates into
Row support, but the hole of its diaphragm is still linear, it is easily dirty stifled.As it can be seen that the structure of film in itself has been largely fixed this
The water treatmenting performance of film, therefore, how to improve the structure of film in itself becomes the main problem that we study.Hair is studied through us
It is existing, it can be by the change that changes the making material of film to realize to this body structure of film.
Invention content
Of the existing technology to overcome the problems, such as, the present invention provides a kind of disc-type that can be effectively improved this body structure of film
Modified diaphragm.
To achieve these goals, the technical solution adopted by the present invention is as follows：
A kind of disc-type is modified the preparation method of diaphragm, includes the following steps：
（1）Casting solution is prepared by the component of following mass percent：
PVDF 16 ~ 30%, glycol monoethyl ether 15 ~ 20%, polyvinylpyrrolidone 20 ~ 25%, dimethylformamide 2 ~
5%, dimethyl pyrrolidone 10 ~ 15%, dimethyl sulfoxide (DMSO) 7 ~ 12%；
（2）Casting solution is poured on clean glass plate, striking makes it under 15 ~ 25 DEG C of temperature condition into first film
Solidification forming；
（3）Automatically disengage glass plate after first film forming, then place it in ultra-pure water impregnate 12 ~ for 24 hours, and changed every 3h
PVDF basement membranes are made after the completion of impregnating in water；
（4）By PVDF basement membranes using distilled water washes clean, 2h is then stood in gnotobasis；
（5）Composite modified reagent is evenly applied to clean PVDF membrane surfaces, is dried in the air naturally at a temperature of 25 ± 3 DEG C
It is dry, modified PVDF membrane is made；
（6）By modified PVDF membrane, support flow-guiding screen and modified PVDF membrane compacting stacked on top of one another in one, modified diaphragm is made
Matrix；
（7）Disk shape is made in Modified Membrane sheet matrix, and the peripheral edge of disk shape is compressed to the one of closing, is also existed
The center of disk shape is opened up through upper and lower installation through-hole, and the disc-type is made and is modified diaphragm.
Wherein, the step（1）It is middle each component material of casting solution is mixed according to quantity after, in 65 ~ 100 DEG C of temperature condition
24 ~ 36h of lower stirring forms casting solution to being uniformly dissolved.
Thus obtained disc-type is modified the structure of diaphragm, including stacking gradually and suppressing the modification in disk shape up and down
Pvdf membrane supports flow-guiding screen and modified PVDF membrane and is led at the disk shape center through all modified PVDF membranes and support
The installation through-hole of drift net, the peripheral edge of two layers of modified PVDF membrane up and down are compressed to the one of closing；The modified PVDF
Film is formed by PVDF basement membranes and in the composite modified coating of PVDF membrane surfaces coating.Wherein, the composite modified coating
The composite modified reagent coated by the PVDF membrane surfaces after cleaning is formed after drying.
As a preferred embodiment, the casting solution is made of the component of following mass percents：
PVDF 30%, glycol monoethyl ether 18%, polyvinylpyrrolidone 22%, dimethylformamide 5%, dimethyl pyrazole
Pyrrolidone 14%, dimethyl sulfoxide (DMSO) 11%.
As a preferred embodiment, the casting solution is made of the component of following mass percents：
PVDF 26%, glycol monoethyl ether 20%, polyvinylpyrrolidone 24%, dimethylformamide 4%, dimethyl pyrazole
Pyrrolidone 14%, dimethyl sulfoxide (DMSO) 12%.
Further, polyvinyl alcohol, 2 ~ 15% mass percentages of the composite modified reagent by 7 ~ 20% mass percents
The polyvinylpyrrolidone of the maleic anhydride of ratio, the dicumyl peroxide of 0.1 ~ 1% mass percent and 0 ~ 3.8% mass percent
The solute uniform dissolution of composition is made in ultrapure aqueous solvent.
As a preferred embodiment, the composite modified reagent is by the polyvinyl alcohol of 15% mass percent, 9% mass percent
The polyvinylpyrrolidone of maleic anhydride, the dicumyl peroxide of 0.5% mass percent and 1.9% mass percent is formed molten
Matter uniform dissolution is made in ultrapure aqueous solvent.
As a preferred embodiment, polyvinyl alcohol of the composite modified reagent by 18% mass percent, 12% mass percent
Maleic anhydride, 1% mass percent dicumyl peroxide form solute uniform dissolution in ultrapure aqueous solvent be made.
Compared with prior art, the invention has the advantages that：
Film made of the present invention has very high suppleness, and bending is unlikely to deform, and surface is smooth, can improve film surface
Water turbulence effect reduce concentration polarization, while the hole formed on film is substantially increased anti-in mandruka reticular structure
The stifled property of dirt, also carries out current potential processing to film surface by modifying agent, makes its more hydrophilic, and film adhesion is strong, be not easy
Separation is peeled off, and present inventive concept is novel, simple in structure, of low cost, convenient and practical, safe and efficient, widely should be had
With prospect, it is suitble to promote and apply.
Specific embodiment
With reference to embodiment, the invention will be further described, and embodiments of the present invention include but not limited to following reality
Apply example.
Embodiment 1
The disc-type is modified diaphragm, and including stacking gradually and suppressing the modified PVDF membrane in disk shape up and down, support is led
Drift net and modified PVDF membrane and at the disk shape center through all modified PVDF membranes and support flow-guiding screen installation lead to
Hole, the peripheral edge of two layers of modified PVDF membrane up and down are compressed to the one of closing；The modified PVDF membrane is by PVDF basement membranes
It is formed with the composite modified coating coated in the PVDF membrane surfaces.Wherein, the composite modified coating is by after cleaning
The composite modified reagent of PVDF membrane surfaces coating is formed after drying.
The disc-type is modified the preparation method of diaphragm, includes the following steps：
（1）Casting solution is prepared by the component of following mass percent：
PVDF 16 ~ 30%, glycol monoethyl ether 15 ~ 20%, polyvinylpyrrolidone 20 ~ 25%, dimethylformamide 2 ~
5%, dimethyl pyrrolidone 10 ~ 15%, dimethyl sulfoxide (DMSO) 7 ~ 12%；
Wherein, after above-mentioned each component material is mixed according to quantity, 24 ~ 36h is stirred under 65 ~ 100 DEG C of temperature condition to molten
Solution is uniform, forms casting solution；
（2）Casting solution is poured on clean glass plate, striking makes it under 15 ~ 25 DEG C of temperature condition into first film
Solidification forming；
（3）Automatically disengage glass plate after first film forming, then place it in ultra-pure water impregnate 12 ~ for 24 hours, and changed every 3h
PVDF basement membranes are made after the completion of impregnating in water；
（4）By PVDF basement membranes using distilled water washes clean, 2h is then stood in gnotobasis；
（5）Composite modified reagent is evenly applied to clean PVDF membrane surfaces, is dried in the air naturally at a temperature of 25 ± 3 DEG C
It is dry, modified PVDF membrane is made；
（6）By modified PVDF membrane, support flow-guiding screen and modified PVDF membrane compacting stacked on top of one another in one, modified diaphragm is made
Matrix；
（7）Disk shape is made in Modified Membrane sheet matrix, and the peripheral edge of disk shape is compressed to the one of closing, is also existed
The center of disk shape is opened up through upper and lower installation through-hole, and the disc-type is made and is modified diaphragm.
Wherein, the composite modified reagent is by the polyvinyl alcohol of 7 ~ 20% mass percents, the horse of 2 ~ 15% mass percents
Carry out the polyvinylpyrrolidone composition of acid anhydrides, the dicumyl peroxide of 0.1 ~ 1% mass percent and 0 ~ 3.8% mass percent
Solute uniform dissolution is made in ultrapure aqueous solvent.When preparing composite modified reagent, above-mentioned solute is dissolved in 80 ± 3 DEG C super
In pure water solvent, 15 ~ 25min is stirred to above-mentioned mixed solution by the speed of 75 ~ 150rad/min using at the uniform velocity blender, is made each
Component is sufficiently mixed, and forms gluing state.
Through experiment, the permeant flux of the PVDF basement membranes is 8 ~ 10L/hm2, the rate of recovery is 60 ~ 80%.And after modification
Diaphragm through experiment, permeant flux improve 30~50%, the rate of recovery is improved to 75~90%.
Embodiment 2
The present embodiment and embodiment 1 difference lies in：
The casting solution is made of the component of following mass percents：
PVDF 30%, glycol monoethyl ether 18%, polyvinylpyrrolidone 22%, dimethylformamide 5%, dimethyl pyrazole
Pyrrolidone 14%, dimethyl sulfoxide (DMSO) 11%.
The composite modified reagent is by the polyvinyl alcohol of 15% mass percent, the maleic anhydride of 9% mass percent, 0.5%
The solute uniform dissolution that the dicumyl peroxide of mass percent and the polyvinylpyrrolidone of 1.9% mass percent are formed in
It is made in ultrapure aqueous solvent.
Embodiment 3
The present embodiment and embodiment 1 difference lies in：
The casting solution is made of the component of following mass percents：
PVDF 26%, glycol monoethyl ether 20%, polyvinylpyrrolidone 24%, dimethylformamide 4%, dimethyl pyrazole
Pyrrolidone 14%, dimethyl sulfoxide (DMSO) 12%.
The composite modified reagent is by the polyvinyl alcohol of 18% mass percent, the maleic anhydride of 12% mass percent, 1%
The solute uniform dissolution that the dicumyl peroxide of mass percent is formed is made in ultrapure aqueous solvent.
Above-described embodiment is merely a preferred embodiment of the present invention, and it is not intended to limit the protection scope of the present invention, as long as using
The design principle of the present invention and the variation for carrying out non-creative labour on this basis and making, should all belong to the present invention's
Within protection domain.
Claims (5)
1. a kind of disc-type is modified the preparation method of diaphragm, which is characterized in that includes the following steps：
(1) casting solution is prepared by the component of following mass percent：
PVDF 16~30%, glycol monoethyl ether 15~20%, polyvinylpyrrolidone 20~25%, dimethylformamide 2
~5%, dimethyl pyrrolidone 10~15%, dimethyl sulfoxide (DMSO) 7~12%,
After each component material of casting solution is mixed according to quantity, it is equal to dissolving that 24~36h is stirred under 65~100 DEG C of temperature condition
It is even, form casting solution；
(2) casting solution is poured on clean glass plate, striking makes it be solidified under 15~25 DEG C of temperature condition into first film
Forming；
(3) automatically disengage glass plate after just film forming, then place it in ultra-pure water impregnate 12~for 24 hours, and change one every 3h
PVDF basement membranes are made after the completion of impregnating in secondary water；
(4) then PVDF basement membranes are stood into 2h using distilled water washes clean in gnotobasis；
(5) composite modified reagent is evenly applied to clean PVDF membrane surfaces, the naturally dry at a temperature of 25 ± 3 DEG C,
Modified PVDF membrane is made；
(6) Modified Membrane chip base is made in one in modified PVDF membrane, support flow-guiding screen and modified PVDF membrane compacting stacked on top of one another
Body；
(7) disk shape is made in Modified Membrane sheet matrix, and the peripheral edge of disk shape is compressed to the one of closing, also in disk
The center of shape is opened up through upper and lower installation through-hole, and the disc-type is made and is modified diaphragm；
Wherein, the composite modified reagent is by the polyvinyl alcohol of 7~20% mass percents, the horse of 2~15% mass percents
Carry out the polyvinylpyrrolidone structure of acid anhydrides, the dicumyl peroxide of 0.1~1% mass percent and 0~3.8% mass percent
Into solute uniform dissolution in ultrapure aqueous solvent be made.
2. a kind of disc-type according to claim 1 is modified the preparation method of diaphragm, which is characterized in that the casting solution by
The component of following mass percents is formed：
PVDF 30%, glycol monoethyl ether 18%, polyvinylpyrrolidone 22%, dimethylformamide 5%, dimethyl pyrrole
Alkanone 14%, dimethyl sulfoxide (DMSO) 11%.
3. a kind of disc-type according to claim 1 is modified the preparation method of diaphragm, which is characterized in that the casting solution by
The component of following mass percents is formed：
PVDF 26%, glycol monoethyl ether 20%, polyvinylpyrrolidone 24%, dimethylformamide 4%, dimethyl pyrrole
Alkanone 14%, dimethyl sulfoxide (DMSO) 12%.
4. the preparation method of diaphragm is modified according to a kind of disc-type of claims 1 to 3 any one of them, which is characterized in that institute
Composite modified reagent is stated by the polyvinyl alcohol of 15% mass percent, the maleic anhydride of 9% mass percent, 0.5% mass hundred
Divide the solute uniform dissolution that the dicumyl peroxide of ratio and the polyvinylpyrrolidone of 1.9% mass percent are formed in ultra-pure water
It is made in solvent.
5. the preparation method of diaphragm is modified according to a kind of disc-type of claims 1 to 3 any one of them, which is characterized in that institute
Composite modified reagent is stated by the polyvinyl alcohol of 18% mass percent, the maleic anhydride of 12% mass percent, 1% mass percentage
The solute uniform dissolution that the dicumyl peroxide of ratio is formed is made in ultrapure aqueous solvent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510985978.2A CN105536552B (en) | 2015-12-25 | 2015-12-25 | A kind of disc-type is modified the preparation method of diaphragm |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510985978.2A CN105536552B (en) | 2015-12-25 | 2015-12-25 | A kind of disc-type is modified the preparation method of diaphragm |
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| CN105536552A CN105536552A (en) | 2016-05-04 |
| CN105536552B true CN105536552B (en) | 2018-06-29 |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4613436A (en) * | 1984-10-31 | 1986-09-23 | Separex Corporation | Membrane assembly for fluid separations-disk |
| DE60033016T2 (en) * | 1999-12-28 | 2007-08-30 | Kanazawa, Hitoshi | METHOD FOR MODIFYING A POLYMERIC MATERIAL AND USE THEREOF |
| DK2114477T3 (en) * | 2007-02-28 | 2012-08-20 | Dsm Ip Assets Bv | Hydrophilic coating |
| CN104984663A (en) * | 2015-06-15 | 2015-10-21 | 黄义忠 | Film casting liquid for PVDF flat membrane and preparing method for PVDF flat membrane |
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Effective date of registration: 20190114 Address after: 610404 No. 22 Guanghua Road, Huaikou Town, Jintang County, Chengdu City, Sichuan Province Patentee after: SICHUAN MEIFUTE WATER CO.,LTD. Address before: 610000 environmental protection Avenue, Jintang Industrial Park, huaikou Town, Jintang County, Chengdu, Sichuan Patentee before: Chengdu Environmental Protection Industry Group Co.,Ltd. Foote |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191024 Address after: 610000 No. 8 Wang Tong Lane, Qingyang District, Sichuan, Chengdu Patentee after: SICHUAN MEIFUTE ENVIRONMENT TREATMENT Co.,Ltd. Address before: 610404 No. 22 Guanghua Road, Huaikou Town, Jintang County, Chengdu City, Sichuan Province Patentee before: SICHUAN MEIFUTE WATER CO.,LTD. |
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| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: No. 22 Guanghua Road, Huaikou Street, Jintang County, Chengdu City, Sichuan Province, 610000 (within Jintang Industrial Park, Sichuan) Patentee after: Sichuan Meifeng Environmental Governance Co.,Ltd. Address before: No.8, Wangjiatang lane, Qingyang District, Chengdu, Sichuan 610000 Patentee before: SICHUAN MEIFUTE ENVIRONMENT TREATMENT Co.,Ltd. |